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A Little bit about the Medical Recommendations of Ideal Body Weight

By Steven B. Halls, MD

The medical profession likes simplicity. Researchers have tested if being overweight causes health risks, using a body mass index (BMI) of 25 kg/m2 as the definition of overweight. This is obviously too simple, but it is a common method used in data analysis. Numerous studies have confirmed that having a body mass index over 25 kg/m2 is associated with increased risk of diseases. Conditions such as diabetes, high blood pressure, heart attacks, etc), and risk of a shortened lifespan3 are associated with being overweight.

It is important to point out that this simple definition of overweight by medical researchers is not representative of how people regard each other. Neither is the definition of overweight how a doctor would judge an individual patient, or a nutritionists.

Furthermore, the Body Mass Index of 25 kg/m2 definition of overweight is a unisex threshold that suits neither men or women particularly well. Nevertheless, a Body Mass Index (BMI) of 25 to 29.9 is defined as overweight by some important institutions1.

Another problem with all of the above definitions, is that they only apply to adults. For children under age 18, the "normal" BMI changes with age. Thus, to judge a child’s Body Mass Index, you should refer to the boys BMI chart or girls BMI chart instead. In my opinion, children whose BMI is somewhere inbetween the 5th to 85th percentiles, should be considered normal, and not overweight.

Discussion

There are MANY websites on the internet that offer a simple "body mass index calculator" function. The vast majority of these websites use the too-simple definition of overweight at 25 kg/m2. You should be wary of these types of websites, not only because of their simplicity.

Other problems are that BMI websites do not take into account gender, or children or different ages of adults. The halls.mdBody Mass Index Calculator does all of these things.

The halls BMI calculator is a versatile tool which also computes the "percentile" statistics of the individual compared to the equivalent population.

Did you notice the red link above? It goes to a weight percentiles calculator.